# apu math302 quiz 1 done on april 2015

Question 1 of 20

1.0/ 1.0 Points

A variable is classified as ordinal if:

A.we track the

variable through a period of time

B.the data arise from

continuous measurements

C.there is a natural ordering of categories

D.there is no natural

ordering of categories

Question 2 of 20

1.0/ 1.0 Points

Which of the following indicates how many observations fall

into various categories?

A.The sample table

B.The tabulation

scale

C.The frequency table

D.The Likert scale

Question 3 of 20

1.0/ 1.0 Points

Find the z-score for each student and indicate which one has

a better relative position. An Art Major earned a grade of 46 on an exam with

f$ar{x}f$ = 50 and s = 5; A Theater

Major earned a grade of 70 on an exam with f$ar{x}f$ = 75 and s = 7.

A.The art major has a

higher relative position than the theater major.

B.Both students have

the same score.

C.The theater major has a higher relative

position than the art major.

D.The higher score

cannot be determined.

Question 4 of 20

1.0/ 1.0 Points

Which of the following is the graphical analog of a

frequency table?

A.The scatterplot

B.The time series

plot

C.The histogram

D.The contingency

table

Question 5 of 20

1.0/ 1.0 Points

Which of the following are the three most common measures of

central location?

A.Mean, variance, and

standard deviation

B.Mean, median, and mode

C.Mean, median, and

variance

D.Mean, median, and

standard deviation

Question 6 of 20

1.0/ 1.0 Points

Suppose that a histogram of a data set is approximately

symmetric and “bell shaped”. Approximately, what percent of the

observations are within three standard deviations of the mean?

A.95%

B.99.7%

C.50%

D.68%

Question 7 of 20

0.0/ 1.0 Points

What type of

sampling is being employed if the population is divided into economic classes

and a sample is chosen from each economic class to be surveyed?

In

A.cluster sampling

B.systematic sampling

C.stratified sampling

D.random sampling

Question 8 of 20

1.0/ 1.0 Points

The length of the box in the boxplot portrays the

A.interquartile range

B.median

C.mean

D.range

Question 9 of 20

1.0/ 1.0 Points

What kind of relationship between x and y is demonstrated by

the scatter plot below?

A.A positive linear

relationship

B.No linear

relationship

C.This is not a

scatter plot

D.A negative linear relationship

Question 10 of 20

1.0/ 1.0 Points

A population includes:

A.only households

B.all objects of interest in a particular

study

C.only machines

D.only people

Question 11 of 20

1.0/ 1.0 Points

Suppose that a histogram of a data set is approximately

symmetric and “bell shaped”. Approximately what percent of the

observations are within one standard deviation of the mean?

A.99.7%

B.68%

C.95%

D.50%

Question 12 of 20

1.0/ 1.0 Points

The difference between the first and third quartile is

called the

A.mid range

B.interquartile range

C.unimodal range

D.interdependent

range

Part 2 of 3 – 2.0/

6.0 Points

Question 13 of 20

0.0/ 1.0 Points

Accepted characters: numbers, decimal point markers (period

or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000),

“E” or “e” (used in scientific notation). NOTE: For

scientific notation, a period MUST be used as the decimal point marker.

Complex numbers should be in the form (a + bi) where

“a” and “b” need to have explicitly stated values.

For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is

valid whereas {9i} is not.

The histogram below represents scores achieved by 250 job applicants

on a personality profile.

The histogram below represents scores achieved by 250 job

applicants on a personality profile.

Sixty percent of the job applicants scored below what

value? Place your answer in the blank.

Do not use any stray symbols. For example, 123 would be a legitimate answer.

.30

Question 14 of 20

0.0/ 1.0 Points

Accepted characters: numbers, decimal point markers (period

or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000),

“E” or “e” (used in scientific notation). NOTE: For

scientific notation, a period MUST be used as the decimal point marker.

Complex numbers should be in the form (a + bi) where

“a” and “b” need to have explicitly stated values.

For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is

valid whereas {9i} is not.

The following data represent the number of children in a

sample of 10 families from Chicago: 4, 2, 1, 1, 5, 3, 0, 1, 0, and 2.

Compute the median number of children. Place your answer,

rounded to two decimal places, in the blank. For example, 3.45 would be a

legitimate entry. 1.90

Question 15 of 20

0.0/ 1.0 Points

Accepted characters: numbers, decimal point markers (period

or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000),

“E” or “e” (used in scientific notation). NOTE: For

scientific notation, a period MUST be used as the decimal point marker.

Complex numbers should be in the form (a + bi) where

“a” and “b” need to have explicitly stated values.

For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is

valid whereas {9i} is not.

The following data represent the number of children in a

sample of 10 families from Chicago: 4, 2, 1, 1, 5, 3, 0, 1, 0, and 2.

Compute the variance of the data. Place your answer, rounded

to two decimal places, in the blank. For example, 3.45 would be a legitimate

entry. 2.49

Question 16 of 20

1.0/ 1.0 Points

Accepted characters: numbers, decimal point markers (period

or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000),

“E” or “e” (used in scientific notation). NOTE: For scientific

notation, a period MUST be used as the decimal point marker.

Complex numbers should be in the form (a + bi) where

“a” and “b” need to have explicitly stated values.

For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is

valid whereas {9i} is not.

A sample of 150 students at a State University was taken

after the final business statistics exam to ask them whether they went partying

the weekend before the final or spent the weekend studying, and whether they

did well or poorly on the final. The following table contains the result.

Did Well on Exam Did Poorly on Exam

Studying for Exam 60 15

Went Partying 22 53

If the sample is a good representation of the population,

what percentage of the students in the population should we expect to spend the

weekend studying and do poorly on the final exam? Place your answer in the blank, rounded to 2

decimal places. Do not use a percentage sign (%). For example, 44.44 would be a

legitimate answer. 10.00

Question 17 of 20

1.0/ 1.0 Points

Accepted characters: numbers, decimal point markers (period

or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000),

“E” or “e” (used in scientific notation). NOTE: For

scientific notation, a period MUST be used as the decimal point marker.

Complex numbers should be in the form (a + bi) where

“a” and “b” need to have explicitly stated values.

For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is

valid whereas {9i} is not.

The histogram below represents scores achieved by 250 job

applicants on a personality profile.

The histogram below represents scores achieved by 250 job

applicants on a personality profile.

Seventy percent of the job applicants scored above what

value? Place your answer in the blank. Do not use any stray symbols. For

example, 123 would be a legitimate answer.

20

Question 18 of 20

0.0/ 1.0 Points

Accepted characters: numbers, decimal point markers (period

or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000),

“E” or “e” (used in scientific notation). NOTE: For

scientific notation, a period MUST be used as the decimal point marker.

Complex numbers should be in the form (a + bi) where

“a” and “b” need to have explicitly stated values.

For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is

valid whereas {9i} is not.

A sample of 150 students at a State University was taken

after the final business statistics exam to ask them whether they went partying

the weekend before the final or spent the weekend studying, and whether they

did well or poorly on the final. The following table contains the result.

Did Well on Exam Did Poorly on Exam

Studying for Exam 60 15

Went Partying 22 53

If the sample is a good representation of the population,

what percentage of those who did poorly on the final exam should we expect to

have spent the weekend studying? Place

your answer in the blank, rounded to 2 decimal places. Do not use a percentage

sign (%). For example, 44.44 would be a legitmate answer. 20.00

Part 3 of 3 – 1.0/

2.0 Points

Question 19 of 20

0.0/ 1.0 Points

A histogram is skewed to the left (or negatively skewed) if

it has a single peak and the values of the distribution extend much further to

the right of the peak than to the left of the peak.

In

True

False

Answer Key: False

Question 20 of 20

1.0/ 1.0 Points

The number of car insurance policy holders is an example of

a discrete random variable

True

False

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